This work was supported by the National Institutes of Health National Institute of Allergy and Infectious Diseases [Grant 5-P30 A1050410]; and the Office of Women’s Health, U.S. Food and Drug Administration [Grant FRP#: FDA-SOL-05-00050]. K. I. was a drug research and development fellow (2006-2008) supported by GlaxoSmithKline.

The author regrets this error and any inconvenience it may have caused.